男性,34岁,阵发性上腹痛7天,B超示胆囊结石,首选的治疗是
A.胆囊切开取石术
B.胆囊切除术
C.口服鹅脱氧胆酸
D.体外震波碎石
E.观察
参考答案:B
Rainforests _____ and burned at such a speed that they will disappear from the earth in the near future. [ ]
A. cut
B. are cut
C. are being cut
D. have been cut
简述面侧区的间隙。